Corrupt URL from M$ Windows Phone 8.1

[GriffMG]

I have documents with QR codes on them that people scan with Android and iOS devices all day, thousands of them, the bar codes present a link in the form:

http://www.mysite.com/myprog.asp?a=1&b=2

This works brilliantly, except for when people scan the codes with Windows Phones. When they do that, they get a 404 error (Page not found) and a look at the logs
I can see that something has been appended after the .asp and before the ?a=1.

so a call from an Android device looks like this in the log:

2017-02-22 12:11:10 199.199.199.199 GET /myprog.asp A=1&B=2

and from the WIndows Phone looks like this

2017-02-22 12:11:10 199.199.199.199 GET /myprog.asp?A=1&B=2

I've tried a rewrite rule changing myprog.asp* to myprog.asp, but that just drops the querystring

Anyone any ideas?

Regards

Griff
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